http://data.ordnancesurvey.co.uk/ontology/spatialrelations/

used by 11:

• bathing-water-surveys-guideline-standards-1994-to-2011
• capgrids
• linked-nuts
• southampton-ac-uk-catering-points-of-service
• southampton-ac-uk-cls-extras
• southampton-ac-uk-places
• southampton-ac-uk-room-features
• southampton-ac-uk-services
• southampton-ac-uk-vending-machines
• transport-openuplabs
• uk-postcodes